What does repolarization refer to in heart activity?

Repolarization refers to the relaxation phase of the heart's electrical activity. During this phase, the heart muscle cells reset their electrical charge after depolarization, which is associated with the contraction of the heart. When the cells repolarize, they return to their resting state, allowing for the heart to refill with blood before the next contraction occurs. This process is crucial for maintaining a rhythmic and efficient heartbeat. Without proper repolarization, the heart would not be able to function effectively, leading to potential arrhythmias or other cardiac complications. Understanding repolarization helps in interpreting EKG readings, as specific waves and segments represent this phase of the heart cycle.